> Also how many hobbyists are going to have reels of parts? Reels of small resistors or caps are ballpark of $20. I'd be happy to buy one for any part that is likely to get use multiple times on a board and again on the next board. -- These are my opinions. I hate spam.

Hi If you are doing the sort of boards that started this discussion (100+ parts per board / 5 to 10 boards) a reel of bypass caps will get used up pretty fast. Shame on you if your designs don’t standardize on a bypass cap or three and about five resistors. Resistors reels of 10,000 are ~$10 so that’s $50 for your “most used” resistors. Caps in full reels of 4,000 at $16 a reel are not all that hard to find. If two of your three bypass caps are covered that way, you are up to $82 for inventory. Your third cap is likely a tantalum and it will be a bit more. Buy it in a "short reel" of some sort. Net result (at least for the bulk of your passives) is a startup inventory cost of < $100. Compared to all the other stuff you are buying. That’s not a big deal. Bob > On Jun 25, 2016, at 2:27 AM, Hal Murray <hmurray@megapathdsl.net> wrote: > >> Also how many hobbyists are going to have reels of parts? > > Reels of small resistors or caps are ballpark of $20. I'd be happy to buy > one for any part that is likely to get use multiple times on a board and > again on the next board. > > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

At home I have a parts bin and I find I need to stock about two dozen resister values. I can buy a pack of 1,200 resistors for about $12 and there are all 24 values in the package. If I had to spend $20 per value I'd have to spend $480 and some how find space to store 24 reels. Yes, one project is not going to need all 24 values but over time they all get used. The problem is worse with ICs. I'm likely to only need one of a certain part ever. Yes there are some common parts like an op amp but mostly each project is unique. So it seem silly to program a machine to pick on one single part and place it on one PCB. I can do that quicker with tweezers. For the machine to be use any use to me it needs to be "zero setup time". I think the ideal hobby sized machine is one that does not need parts on tape or reels. It would be much slower per PCB stuffed but much faster to get the first PCB finished. That is pretty much why I do hand work. On Fri, Jun 24, 2016 at 11:27 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > > Also how many hobbyists are going to have reels of parts? > > Reels of small resistors or caps are ballpark of $20. I'd be happy to buy > one for any part that is likely to get use multiple times on a board and > again on the next board. > > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California

Yes,

Hi > On Jun 25, 2016, at 12:56 PM, Chris Albertson <albertson.chris@gmail.com> wrote: > > At home I have a parts bin and I find I need to stock about two dozen > resister values. Ok, chip resistors run about ten for a penny. Buy 1,000 of each for a buck a value. So far you have spent $24 and maybe tossed 10 resistors on each batch to come up with a good leader. Put the 10 pieces in a tray and use them for rework. > I can buy a pack of 1,200 resistors for about $12 and > there are all 24 values in the package. With the chips you now have 20X as many resistors for 2X the cost. > If I had to spend $20 per value > I'd have to spend $480 and some how find space to store 24 reels. If you spend $20 per value, you have 20,000 resistors per value. > Yes, > one project is not going to need all 24 values but over time they all get > used. The same might be true of 20,000 but it might not be in a couple of lifetimes :) > > The problem is worse with ICs. I'm likely to only need one of a certain > part ever. Run them from a tray unless they are a common part > Yes there are some common parts like an op amp but mostly each > project is unique. So it seem silly to program a machine to pick on one > single part and place it on one PCB. Unless the machine already knows where the tray is and you simply tell it “tray 3 or Reel 6”. > I can do that quicker with tweezers. Try a vacuum pickup … lots easier. > For the machine to be use any use to me it needs to be "zero setup time”. Well, your manual place process is not zero setup time so it is not clear that this is a reasonable goal. > > I think the ideal hobby sized machine is one that does not need parts on > tape or reels. Again, not a reasonable goal since there is no practical way to do that. Bob > It would be much slower per PCB stuffed but much faster to > get the first PCB finished. That is pretty much why I do hand work. > > > > On Fri, Jun 24, 2016 at 11:27 PM, Hal Murray <hmurray@megapathdsl.net> > wrote: > >>> Also how many hobbyists are going to have reels of parts? >> >> Reels of small resistors or caps are ballpark of $20. I'd be happy to buy >> one for any part that is likely to get use multiple times on a board and >> again on the next board. >> >> >> >> -- >> These are my opinions. I hate spam. >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.